| Oconomowoc to Opwijk | 4,103.12 mi (6,603.33 km) |
| Oconomowoc to Ostend | 4,047.04 mi (6,513.07 km) |
| Oconomowoc to Oud-Heverlee | 4,125.85 mi (6,639.92 km) |
| Oconomowoc to Oud-Turnhout | 4,119.58 mi (6,629.82 km) |
| Oconomowoc to Oudenaarde | 4,085.81 mi (6,575.48 km) |
| Oconomowoc to Oudenburg | 4,051.54 mi (6,520.33 km) |
| Oconomowoc to Oupeye | 4,166.42 mi (6,705.20 km) |
| Oconomowoc to Overijse | 4,122.79 mi (6,634.98 km) |
| Oconomowoc to Overpelt | 4,139.09 mi (6,661.22 km) |
| Oconomowoc to Paal | 4,136.80 mi (6,657.53 km) |
| Oconomowoc to Peer | 4,143.57 mi (6,668.43 km) |
| Oconomowoc to Pepinster | 4,178.13 mi (6,724.06 km) |
| Oconomowoc to Peruwelz | 4,097.35 mi (6,594.04 km) |
| Oconomowoc to Perwez | 4,139.09 mi (6,661.22 km) |
| Oconomowoc to Philippeville | 4,145.06 mi (6,670.83 km) |
